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Thanks for all the replies on SD card. I did buy a Kingston 32GB Class 4 card. <BR>
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It has not been flawless. What I have seen is when it has disappeared, it may be when battery is less than 70% charge, and I've plugged it in, then gone to Settings and told it to mount card, and all appears to be well. <BR>
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I need more data points, but the theory that lower voltage causes SD to disappear seems to have some credence. Whether this is no different than with the old SD card is not clear. <BR>
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Neal <BR>
MNOP Ltd<BR>
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